gridview自动求和及合并多列多行单元格

自动求和代码如下：

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowIndex >= 0)
        {
            sum += Convert.ToInt32(e.Row.Cells[4].Text);
        }
        else if (e.Row.RowType == DataControlRowType.Footer)
        {
            e.Row.Cells[1].Text = "总分为：";
            e.Row.Cells[2].Text = sum.ToString();
            e.Row.Cells[3].Text = "平均分：";
            e.Row.Cells[4].Text = ((int)(sum / GridView1.Rows.Count)).ToString();
        }
    }

合并相同的单元格：

/// <summary>
    /// 判断gridview控件的相邻单元格中的数据是否相同，如果相同，则合并单元格
    /// </summary>
    private void gvRender()
    {
        if (GridView1.Rows.Count <= 1)
        {
            return;
        }

        for (int i = 0; i < GridView1.Columns.Count; i++)
        {
            TableCell tc = GridView1.Rows[0].Cells[i];
            for (int j = 1; j < GridView1.Rows.Count; j++)
            {
                TableCell newtc = GridView1.Rows[j].Cells[i];
                if (newtc.Text == tc.Text)      //判断当前列相邻的单元格的内容是否相同
                {
                    newtc.Visible = false;      //如果相同则隐藏其中一个单元格
                    if (tc.RowSpan == 0)       
                    {
                        tc.RowSpan = 1;
                    }
                    tc.RowSpan++;
                    tc.VerticalAlign = VerticalAlign.Middle;
                }
            }
        }
    }

记得将ShowFooter设置为true哦；